TFE_Op* var_op_2 = TFE_NewOp(ctx, "VarHandleOp", status);

  string serialized_dtype;
  ASSERT_TRUE(name_and_attrs.attr().find("dtype")->second.SerializeToString(
      &serialized_dtype));
  TFE_OpSetAttrValueProto(
      var_op_2, "dtype",
      reinterpret_cast<const void*>(serialized_dtype.c_str()),
      serialized_dtype.length(), status);
  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);